Question: a bit more collection of terms?

From a newbie:

Is there any way to get the Simpify from the Context Panel to clean up a little more?

I'm impressed with the job it does because it really did the job on some very hairy 5x5 matrices I had.

But I was not able to get it to completely collection all the terms of the following:

Clearly w,x, and y could have been collected like z was.  but I tried a number of approaches and could not get any of them to collect the w,x, and y terms..

Any thoughts about it?

Thanks,

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